Contemporary Control Systems Compact Managed Switches Software Manual for Console Access - Manual (Page 15)

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4.3.4 Configure Port Mirroring
Port mirroring allows one port to copy or “mirror” all traffic transmitted or received by
one or multiple ports. This is useful when an Ethernet diagnostic tool is used. Switches
generally transmit frames only to the ports involved in the conversation, therefore port
mirroring is required if a diagnostic tool needs to capture network traffic. The Configure
Port Mirroring menus allow various adjustments to how data is mirrored, but they apply
only if the Status option is Enabled.
The Mirror Port is the one to which data is copied. Ingress Mirroring Rules apply to
data received by the ports being mirrored. The example in Figure 9 (for an 8-port
switch) has Port 1 defined as the mirror. Source Ports (those having their data copied)
are shown by a “Y” and Figure 9 depicts Ports 2 and 3 chosen as source ports.
The
Divider value specifies the fraction of messages sent by each port. For example, a
Divider value of 7 will send every seventh message to the mirror port, while a value of 1
(as in Figure 9) will send each message to the mirror port.
The
MAC Address options are :
All — mirrors all traffic regardless of MAC address. This is the default. Since no
addressing is used, a Source/Destination Addr line will not appear.
If either of the following options are chosen, a Source/Destination Addr line will
appear beneath the MAC Address line.
Source — mirrors only messages whose source addresses match the
MAC Address entered by the user in the Source Addr below.
Destination — mirrors only messages whose destination addresses match
the MAC Address entered by the user in the Destination Addr below.
Figure 9 — Configure Port Mirroring Ingress Rules